@misc{10481/110401,
year = {2020},
url = {https://hdl.handle.net/10481/110401},
abstract = {A microfluidic paper-based analytical device integrating carbon dot (CDs) is fabricated and used for a fluorometric off-on assay of biothiols. Vinyl sulfone (VS) click immobilization of carbon dots (CDs) on paper was accomplished by a one-pot simplified protocol that uses divinyl sulfone (DVS) as a homobifunctional reagent. This reagent mediated both the click oxa-Michael addition to the hydroxyl groups of cellulose and ulterior covalent grafting of the resulting VS paper to NH2-functionalized CDs by means of click aza-Michael addition. The resulting cellulose nanocomposite was used to engineer an inexpensive and robust microfluidic paper-based analytical device (μPAD) that is used for a reaction-based off-on fluorometric assay of biothiols (GSH, Cys, and Hcy). The intrinsic blue fluorescence of CDs (with excitation/emission maxima at 365/450 nm) is turned off via the heavy atom effect of an introduced iodo group. Fluorescence is turned on again due to the displacement of iodine by reaction with a biothiol. The increase in fluorescence is related to the concentration over a wide range (1 to 200 μM for GSH and 5–200 μM for Cys and Hcy, respectively), and the assay exhibits a low detection limit (0.3 μM for GSH and Cys and 0.4 μM for Hcy). The method allows for rapid screening and can also be used in combination with a digital camera readout},
organization = {Spanish MINECO (CTQ2017-86125 and CTQ2016-78754-C2-1-R)},
organization = {European Regional Development Funds (ERDF)},
publisher = {Springer Nature},
keywords = {Microfluidic paper-based device},
keywords = {Off-on assay},
keywords = {Carbon dots},
title = {A vinyl sulfone clicked carbon dot-engineered microfluidic paper-based analytical device for fluorometric determination of biothiols},
doi = {10.1007/s00604-020-04382-9},
author = {Fernández Mateo, Fernando and Ortiz Gómez, Inmaculada and Ortega Muñoz, Mariano and Marín-Sánchez, Antonio and Orbe Payá, Ignacio De and Hernández Mateo, Fernando and Capitán Vallvey, Luis Fermín and Santoyo González, Francisco and Salinas Castillo, Alfonso},
}